c# - 使用 DataContractSerialize 保存文件时出现序列化错误

Question

我使用此代码序列化所需的对象(使用 DataContractSerialier)

try
{
 using (var stream = File.OpenWrite(filePath))
 {
  var dcs = new DataContractSerializer(typeof(T));
  dcs.WriteObject(stream, obj);
 }
}
catch (Exception ex)
{
 throw new Exception("Error during write object to xml file", ex);
}

i don't understand, but sometimes this method append to end of xml-file some additional symbols. for example :"eInfo>" ( when i deleted 'eInfo>' deserialization works good). i found this when do high load testing (call this method 12000 times without stoping). maybe i can checking that file was saved correctly (try to deserialize saved file), but i think that it bad idea, because we need to run deserialize procees any time when save xml-file.

Answer 1

那是因为 File.OpenWrite 不会截断现有数据。您正在用较少的数据 覆盖一个文件。最后的垃圾是原始文件遗留下来的任何东西。我建议你使用File.Create(实际上是create or overwrite-with-truncate)，或者显式指定truncate，或者在写入之前调用.SetLength(0)。